A film about the personality and life of the medieval singer and composer John Koukouzelis, also called “the Angelvoiced”. John Koukouzelis was a Byzantine composer, singer and reformer of the Byzantine chant. After his death, he was recognized as a saint by the Eastern Orthodox Church. He is considered to be among the most illustrious musicians of the Palaiologos dynasty. Still today, his music remains held in high esteem by Albanians, Bulgarians, Greeks, Macedonians, Romanians and Serbs.